EDP Sciences
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Volume 407, Number 1, August III 2003
Page(s) 137 - 146
Section Galactic structure and dynamics
DOI http://dx.doi.org/10.1051/0004-6361:20030769

A&A 407, 137-146 (2003)
DOI: 10.1051/0004-6361:20030769

The spiral galaxy M 33 mapped in the FIR by ISOPHOT

A spatially resolved study of the warm and cold dust
H. Hippelein1, M. Haas1, R. J. Tuffs2, D. Lemke1, M. Stickel1, U. Klaas1 and H. J. Völk2

1  Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
2  Max-Planck-Institut für Kernphysik, Saupfercheckweg, 69117 Heidelberg, Germany

(Received 28 March 2003 / Accepted 20 May 2003 )

The Sc galaxy M 33 has been mapped with ISOPHOT in the far-infrared, at 60, 100, and 170 $\mu$m. The spatial resolution of these FIR maps allows the separation of spiral arms and interarm regions and the isolation of a large number of star-forming regions. The spectral energy distribution in the FIR indicates a superposition of two components, a warm one originating from dust at ~45 K, and a cold one, at ~16 K. The warm component is concentrated towards the spiral arms and the star-forming regions, and is likely heated by the UV radiation from OB stars. The cold component is more smoothly distributed over the disk, and heated by the diffuse interstellar radiation. For the about 60 star-forming regions detected the H $\alpha$/FIR flux ratio increases significantly with the distance from the galaxy center, probably due to decreasing extinction. An anti-correlation of $F_{{\rm H}a} / F_{60}$ with F170 suggests the intrinsic extinction to be related to the cold dust surface brightness according to $A_V / S_{170} \sim 0.03$ mag MJy -1 sr. For the total galaxy the star formation rate (SFR) derived from the FIR is in agreement with that derived from the de-extincted H $\alpha$ emission. For individual star-forming regions, a consistency between SFRs derived from the optical and from the FIR requires only a fraction of the UV radiation to be absorbed locally. The individual star-forming regions also show a local radio-FIR correlation. This local correlation is, however, due to quite different components than to those that lead to the well-known global radio-FIR correlation for entire galaxies.

Key words: galaxies: spiral -- galaxies: ISM

Offprint request: H. Hippelein, hippelei@mpia-hd.mpg.de

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© ESO 2003